Red Bull remained on top in Friday afternoon practice at Silverstone, with Sebastian Vettel again sneaking ahead of Mark Webber late on.

Once again the team enjoyed a comfortable margin over the rest of the pack, with Adrian Sutil - who took a superb third for Force India - lapping 0.6 seconds slower than Vettel.

Kazuki Nakajima was fourth in his Williams, ahead of Renault's Fernando Alonso and Rubens Barrichello in the best of the Brawns. The Brazilian's championship-leading team-mate Jenson Button was only 13th.

Red Bull did not take long to resume the dominance it had displayed in the morning, as within 13 minutes of the session starting, Webber and Vettel had established themselves in first and second.

That would be where they remained, with Webber getting down to a 1m19.597s just before the half-hour mark and staying on top until Vettel edged ahead by 0.141s with 20 minutes to go.

Webber ended the session parked in the run-off at Stowe, having drifted slightly wide at the final part of Becketts and clouted a kerb hard with the underside of his car. The Red Bull immediately lost drive and coasted down the Hangar Straight before pulling off.

But with few drivers making significant improvements at the end of the session, Webber was able to stay second.

Sutil grabbed third early on and stayed there for the rest of the afternoon, suggesting that Force India's upgrades had given the team a performance lift. The German's session came to a slightly bizarre end, though, as he clipped his team-mate Giancarlo Fisichella's front wing when driving back into his pit area as the Italian's car was pushed into the garage.

Nakajima was 0.3s and five places clear of his Williams team-mate Nico Rosberg in fourth, with Alonso continuing Renault's strong morning form in fifth ahead of Barrichello, having been frustrated to be delayed behind the Brawn in the closing minutes.

Last year's winner Lewis Hamilton took an encouraging seventh for McLaren, with Jarno Trulli (Toyota), Rosberg and Nelson Piquet (Renault) completing the top ten.

Robert Kubica managed to take 11th for BMW despite his crew having to carry out an extremely rapid engine change after worryingly low oil pressure readings were noted.

Ferrari languished in 17th and 18th, both drivers one and a half seconds off the pace.

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